US20050274419A1 - Valve arrangement - Google Patents
Valve arrangement Download PDFInfo
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- US20050274419A1 US20050274419A1 US11/149,904 US14990405A US2005274419A1 US 20050274419 A1 US20050274419 A1 US 20050274419A1 US 14990405 A US14990405 A US 14990405A US 2005274419 A1 US2005274419 A1 US 2005274419A1
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- United States
- Prior art keywords
- valve
- safety
- connection
- valve arrangement
- arrangement according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims description 23
- 230000007935 neutral effect Effects 0.000 claims description 11
- 230000008054 signal transmission Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 9
- 238000013461 design Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000002567 autonomic effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- WZAPMUSQALINQD-UHFFFAOYSA-M potassium;ethenyl sulfate Chemical compound [K+].[O-]S(=O)(=O)OC=C WZAPMUSQALINQD-UHFFFAOYSA-M 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/008—Valve failure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/08—Assemblies of units, each for the control of a single servomotor only
- F15B13/0803—Modular units
- F15B13/0846—Electrical details
- F15B13/0867—Data bus systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
- F15B2211/8636—Circuit failure, e.g. valve or hose failure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/87—Detection of failures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/875—Control measures for coping with failures
- F15B2211/8755—Emergency shut-down
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
- Y10T137/8175—Plural
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
- Y10T137/8225—Position or extent of motion indicator
- Y10T137/8242—Electrical
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/877—With flow control means for branched passages
- Y10T137/87885—Sectional block structure
Abstract
Description
- The invention concerns a valve arrangement with a high-pressure connection, a low-pressure connection, at least one control valve, which is accommodated in a control valve module and has at least one working connection for a hydraulic consumer, and a safety valve, which is accommodated in a safety valve module, and which releases or blocks a passage between the high-pressure connection and the control valves, the control valve module and the safety valve module being connected to one component group.
- Such a valve arrangement is known from the company brochure Sauer-Danfoss “PVSK module with integrated diverter valve and P-disconnect function”, edition November 2002.
- With machines and devices performing hydraulic functions, usually several consumers are present, each being controlled by a control valve. For example, in connection with a crane, there are several cylinders, which lift different sections of a jib, a rotary motor, with which the jib can be turned, and, if required, a further hydraulic function, with which a grab mounted at the end of the jib can be activated. Similar conditions exist with other devices with hydraulic functions, for example mobile working platforms, diggers, etc.
- In this connection, the control valves are connected to a component group, which is supplied with pressurised hydraulic fluid via the high-pressure connection. The control valves can, for example, be proportional valves, which permits the flow of a predetermined volume flow of hydraulic fluid to the working connection and thus to the consumer in dependence of the position of a valve element.
- The safety requirements in connection with the safety of devices and machines provided with hydraulic functions are relatively high. Particularly, it is endeavoured to avoid that people are hurt, when errors occur.
- From the brochure mentioned above, it is therefore known to combine the control valves with a safety valve. This safety valve interrupts the supply of hydraulic fluid to the control valves, when no supply is desired. For example, the safety valve can be operated in such a manner that the control valves are cut off from the supply, when a vehicle, which is provided with the hydraulic functions, drives in a street. When, for example, this vehicle is equipped with a mobile crane, it is under no circumstances permitted to operate this crane during the drive.
- The invention is based on the task of providing a valve arrangement with a high safety level.
- With a valve arrangement as mentioned in the introduction, this task is solved in that each control valve has an error detection device, that the safety valve module has a safety switch device and that the component group has a connection between the safety switch device and the error detection device.
- In the case of an error in a control valve, this embodiment makes it possible to place the complete valve arrangement is a safe state, for example in that the safety valve blocks the supply of pressurised hydraulic fluid from the high-pressure connection to the control valves. This safety function is integrated in the valve arrangement, that is, a blocking of the valve arrangement does not require that firstly the error in the control valves is detected, and then transmitted via a cable to an external monitoring device, which again sends a signal back to the safety valve. On the contrary, the complete safety is integrated in the valve arrangement. Thus, the valve arrangement can initially be configured in the manner, which is desired for the connected consumer. Depending on the number of consumers to be connected, more or less modules can be combined. Usually, module housings are connected laterally by means of flanges. However, this is not necessarily required. Also embodiments, in which hydraulic pipes exist between modules, can be imagined. Such an embodiment is still considered to be a “component group”. The complete valve arrangement with all control valve modules and the safety valve module can then be tested, not only with regard to operability, but also with regard to meeting the safety requirements. This test can be made by the manufacturer, so that in a manner of speaking the valve arrangement is autonomic. Thus, such a valve arrangement is completely independent of application. In principle, it does not matter at all, which components exist around the valve group, and also it does not matter, whether a crane, a working platform or a tractor is concerned. The safety lies in the valve arrangement itself. This also simplifies the work of approving authorities, as, when safety is concerned, these authorities only have to consider the valve arrangement, not however an external wiring of the valve arrangement. The connection between the control valves and the safety switch device of the safety valve module can have a relatively simple design. It merely has to ensure that in case of an error, an error signal reaches the safety switch device, which will activate the safety valve to block the connection between the high-pressure connection and the control valves. The safety switch device can also assume the task of a “control device” or a “controller”. These devices can, however, also be provided separately from the safety switch device outside the valve arrangement. They are then connected with the valve arrangement via a signal path, for example, a CAN-bus.
- Preferably, the connection has a connection that is led to the outside. Thus, the error signal can also be evaluated outside the valve arrangement, and, for example, stop or reduce the pressure of a pump, which supplies the valve arrangement.
- Preferably, the connection is a signal transmission wire, which is looped through from one control valve to the other and to the safety valve. As stated above, the design of the connection can be relatively simple. It merely has to ensure that a signal, which is generated by an error detection device, reaches the safety valve, or rather, its safety switch device. This can be achieved with a simple, serial connection of the error detection device.
- Preferably, a self-test device is provided, which tests the connection on the occurrence of a predetermined event. It is correct that immediately after the manufacturing and the function test carried through, it may be assumed that the valve arrangement including its safety function works satisfactorily. As, however, some hydraulic appliances are used in relatively rough working environments, for example in building sites, it is expedient to test the connection. This is the purpose of the self-test device, which does, in a simple case, for example, apply an electrical voltage on one end of the connection, and then tests if a corresponding voltage reaches the other end.
- Preferably, the predetermined event is the beginning of a supply with electrical energy. In other words, the self-test is always performed, when the vehicle, the machine or the device is started.
- It is also advantageous that the self-test device tests the error detection device and/or the safety switch device. In this case, it is ensured that the complete safety function works.
- Preferably, the self-test device is located in the safety valve module. As the component group comprises only one safety valve module, but several control valve modules, it is expedient to provide it only once and then in the safety module.
- Preferably, in the error-free case each control valve provides a test signal with additional information. Thus, it is possible to determine, if all control valves are truly error-free. Here, it is not necessary to recognise, in which control valve the error exists. As long as it is not guaranteed that all control valves work without errors, the safety valve will not release the supply of the control valves with pressurised hydraulic fluid.
- It is preferred that the additional information is formed by a prolongation of an impulse. Via the connection, the self-test device sends an impulse to the first control valve. When the control valve recognises an error-free state, it prolongs this impulse by a predetermined length. Each control valve, which defines its state to be error-free, prolongs the impulse by a corresponding length. The safety switch device then merely has to check, if the returned impulse has the length, which corresponds to the number of control valves available. In this case, the safety valve is opened, so that it can supply the control valves with pressurised hydraulic fluid. When the impulse is too short, the safety valve remains or is closed.
- Preferably, the connection is formed in a cable, which is led along the outside of the component group. This embodiment has several advantages. Firstly, an intervention in the module is not required to mount the cable. Secondly, it can relatively easily be seen from the outside, if the connection is in order, at least optically.
- Preferably, the error detection device has a position sensor, which determines the position of a valve element, and a comparator, which compares the determined position with a desired value, a predetermined deviation causing the generation of an error signal. The desired value can, for example be defined by a signal, with which the control valve is controlled.
- Preferably, the error detection device generates a neutral position signal, when the valve element is in its neutral position, and the safety valve closes the passage from the high-pressure connection to the control valves, when all valve elements are in the neutral position. In this case, it is ensured that the supply to the valve arrangement is interrupted, when such a supply is not required. This is an additional safety aspect.
- In the following, the invention is explained on the basis of preferred embodiments in connection with the drawings, showing:
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FIG. 1 a schematic view of a valve arrangement in the form of a block diagram -
FIG. 2 a rear view of a valve arrangement -
FIG. 3 an example of a test signal - A valve arrangement 1 has a high-pressure connection P, a low-pressure connection T;
several control valves 2 to 5 and asafety valve 6. Each control valve has two working connections A, B, to which hydraulic consumers are connected. The hydraulic consumers can have different designs. Examples are a single-acting cylinder 7, double-actingcylinders rotary motor 10. Of course, more than the fourcontrol valves 2 to 5 may be provided. The number ofcontrol valves 2 to 5 depends on the number of desired hydraulic functions. - All
control valves 2 to 5 are proportional valves, having a valve element 11, which is supplied with a pilot pressure via apilot pressure pipe 12. The pilot pressure of thepilot pressure pipe 12 is then led on to the valve element 11 via asolenoid valve arrangement 13 so that the valve element is displaced in one direction or the other. In many cases, the valve element 11 is a valve slide. - The valve element 11 can also be displaced by a
mechanical handle 14, for example a lever. - The design of such a
control valve 2 to 5 is known per se and is therefore not explained in detail. The design of such a valve appears from, for example, the catalogue “Load-independent proportionalvalve type PVG 32” of Danfoss Hydraulics, DK-6430 Nordborg, Denmark,edition 12/98. With regard to the design of the control valves, reference is made to the contents of this catalogue. - The
control valves 2 to 5 are not connected directly with the pressure connection P, but with anauxiliary pressure pipe 15, which is led through the valve arrangement 1. Theauxiliary pressure connection 15 is separated from the high-pressure connection P by thesafety valve 6. Thissafety valve 6 has avalve element 16, which, in the neutral position shown, connects the high-pressure connection P with the low-pressure connection T, apressure retaining valve 17 being located in this connection. Thus, in the neutral position shown, a connection from the high-pressure connection P to thecontrol valves 2 to 5 is completely interrupted, that is, no pressurised hydraulic fluid reaches thecontrol valves 2 to 5. Thus, the consumers 7 to 10 cannot be further activated. Under certain circumstances, they can be lowered to a safe position, when the valve elements 11 of thecontrol valves 2 to 5 are activated accordingly. However, it is not possible to supply the consumers 7 to 10 with pressurised hydraulic fluid. - The
safety valve 6 is in astate, in which thevalve element 16 is displaced downwards (in relation to the view inFIG. 1 ). In this case, the high-pressure connection P is connected with theauxiliary pressure pipe 15 and thecontrol valves 2 to 5 are practically supplied in the “normal operation”. When thevalve element 16 is displaced in the opposite direction, apressure connection 18 is additionally connected with the high-pressure connection P. - Each
control valve 2 to 5 has aposition sensor 19, which detects the position of the valve element 11 and compares it with a desired value, which is supplied via a control cable, not shown in detail. Theposition sensors 19 are connected with asafety signal cable 20, which is connected with asafety switch device 21 in thesafety valve 6. Instead of the virtual cable shown, also a wireless connection is possible, for example via radio, sound, light or the like. In principle, also a separate CAN-bus is possible. - When a
position sensor 19 determines that the position of the valve element 11 deviates by more than a predetermined value from the desired position, this is regarded as an error and reported to thesafety switch device 21. Of course also other criteria can be used for the occurrence of an error. Thesafety switch device 21 then activates thevalve element 16 and moves it to the neutral position shown, in which the high-pressure connection P is separated from thecontrol valves 2 to 5. - In a manner of speaking, the valve arrangement 1 is thus safe in itself, that is, it has an integrated safety function, with which it is not required that the error is first reported to a superior controller (for example a microcomputer) and from here back to the
safety valve 6. On the contrary, the error control is autarchic, that is, thesafety valve 6 is activated immediately, when an error occurs somewhere in the valve arrangement 1. It therefore no longer has to be considered that an error could occur in the communication from the valve arrangement 1 to a superior system and back. Thus, it is substantially simpler to calculate an error probability, which makes it much easier to get an approval from the authorities. The approval authorities then merely have to consider the valve arrangement 1, as in principle it does not matter, which components the valve arrangement 1, which can also be called “valve group”, is controlling. - The
safety signal cable 20 does not have to be led inside the valve arrangement 1. It can also be made as an external electrical wire, which is led along the outside of the valve arrangement 1, as shown schematically inFIG. 2 . -
FIG. 2 shows the rear of a different valve arrangement 1 with thesafety valve 6, thecontrol valves 2 to 5 fromFIG. 1 andadditional control valves 2′ to 5′, which have been added. Eachcontrol valve 2 to 5, 2′ to 5′ are located in acontrol valve module 22, which has acontrol valve housing 23. Thesafety valve 6 is located in a safety valve module 24, which has asafety valve housing 25. Thehousings screw bolts 26. - The rear of the
housing uniform bushings 27, which are, in the present case, supplied with six electrical connections. Five of these connections serve the accommodation of a CAN-bus, which has five cables 28 (control voltage), 29 (mass), 30 (CAN-low), 31 (CAN-high) and 32 (supply voltage solenoid valves). The sixth bushing is connected with thesafety signal cable 20, which can, as stated above, exist in the form of a looped through electrical cable. Physically, it can be integrated in the cable package forming the CAN-bus. - The
safety switch device 21 in thesafety valve 6 has a self-test function, that is, it also forms a self-test device. Each time the supply voltage is switched on, the self-test device controls, for example via thecable 28 or via thecable 32, if thesafety signal cable 20 is passable, that is, not interrupted. Additionally, it is checked, if theindividual control valves 2 to 5, 2′ to 5′ are able to perform error monitoring. A simple method is shown inFIG. 3 . - The
safety valve 6, or rather, thesafety switch device 21, sends animpulse 33 with the length l. The followingcontrol valve 5′ receives this impulse and sends animpulse 34 with thelength 2×l. Thenext control valve 4′ acts similarly, as it receives theimpulse 34 and sends apulse 35 with thelength 3×l. This process is repeated with allcontrol valves 2 to 5, 2′ to 5′. Thelast control valve 2 then generates animpulse 36 with thelength 9×l, which is sent back to thesafety valve 6. Thesafety valve 6 then merely has to check, if theimpulse 36 actually has the length of 9×l. When theimpulse 36 has a shorter length, then one of thecontrol valves 2 to 5, 2′ to 5′ has not defined itself as error-free and accordingly has not prolonged the impulse. In this case, thesafety valve 6 moves to or remains in the neutral position shown inFIG. 1 . - In this state, it does in principle not matter, which of the
control valves 2 to 5, 2′ to 5′ has caused the error. The only important thing is that thesafety valve 6 detects that somewhere an error exists. In connection with an error, it shall not be able to operate the valve arrangement 1 in such a manner that dangerous situations occur. - The
safety signal cable 20 has a connection F, which is led out of the valve arrangement 1. An error, which has occurred, can be reported through this connection. In this case, for example, apump 37, which supplies the valve arrangement 1 with pressure, can work with a lower pressure or be turned off. - The
safety signal cable 20 can also be used for other purposes. For example, thesafety signal cable 20 can report a state, in which all valve elements 11 are in the shown neutral position. In this case, the supply of pressurised hydraulic fluid is not required, and accordingly, thesafety valve 6 can separate the high-pressure connection P from theauxiliary pressure pipe 15.
Claims (12)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410028437 DE102004028437B3 (en) | 2004-06-14 | 2004-06-14 | valve assembly |
DE102004028437.7 | 2004-06-14 |
Publications (2)
Publication Number | Publication Date |
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US20050274419A1 true US20050274419A1 (en) | 2005-12-15 |
US7398796B2 US7398796B2 (en) | 2008-07-15 |
Family
ID=34854147
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/149,904 Active 2027-01-16 US7398796B2 (en) | 2004-06-14 | 2005-06-10 | Valve arrangement |
Country Status (4)
Country | Link |
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US (1) | US7398796B2 (en) |
CN (1) | CN100473845C (en) |
DE (1) | DE102004028437B3 (en) |
GB (1) | GB2415516B (en) |
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EP2157319A1 (en) * | 2008-08-20 | 2010-02-24 | HAWE Hydraulik SE | Hydraulic device for a hydro motor |
WO2013168723A1 (en) * | 2012-05-09 | 2013-11-14 | Smc Kabushiki Kaisha | Solenoid valve system |
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DE102006060334B4 (en) * | 2006-12-20 | 2011-08-25 | Sauer-Danfoss Aps | Hydraulic valve arrangement |
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EP2241765B1 (en) * | 2009-04-17 | 2013-10-09 | HAWE Hydraulik SE | Valve island with CAN-bus bleed-off valve |
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DE102011119945A1 (en) * | 2011-12-01 | 2013-06-06 | Liebherr-Hydraulikbagger Gmbh | hydraulic system |
US9851103B2 (en) | 2011-12-15 | 2017-12-26 | Honeywell International Inc. | Gas valve with overpressure diagnostics |
US9995486B2 (en) * | 2011-12-15 | 2018-06-12 | Honeywell International Inc. | Gas valve with high/low gas pressure detection |
US9557059B2 (en) | 2011-12-15 | 2017-01-31 | Honeywell International Inc | Gas valve with communication link |
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US9273543B2 (en) | 2012-08-17 | 2016-03-01 | S.P.M. Flow Control, Inc. | Automated relief valve control system and method |
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USD707332S1 (en) | 2013-03-15 | 2014-06-17 | S.P.M. Flow Control, Inc. | Seal assembly |
USD707797S1 (en) | 2013-03-15 | 2014-06-24 | S.P.M. Flow Control, Inc. | Seal segment |
DK2811173T4 (en) | 2013-06-04 | 2022-01-10 | Danfoss Power Solutions Aps | HYDRAULIC SYSTEM AND METHOD OF OPERATING HYDRAULIC SYSTEM |
US9568138B2 (en) | 2013-07-01 | 2017-02-14 | S.P.M. Flow Control, Inc. | Manifold assembly |
US9645584B2 (en) | 2014-09-17 | 2017-05-09 | Honeywell International Inc. | Gas valve with electronic health monitoring |
EP3067516A1 (en) * | 2015-03-13 | 2016-09-14 | Caterpillar Global Mining Europe GmbH | Hydraulic assembly for a mining system |
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US11073281B2 (en) | 2017-12-29 | 2021-07-27 | Honeywell International Inc. | Closed-loop programming and control of a combustion appliance |
US10697815B2 (en) | 2018-06-09 | 2020-06-30 | Honeywell International Inc. | System and methods for mitigating condensation in a sensor module |
JP7189114B2 (en) * | 2019-12-04 | 2022-12-13 | Ckd株式会社 | solenoid valve manifold |
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- 2005-06-13 GB GB0511979A patent/GB2415516B/en not_active Expired - Fee Related
- 2005-06-14 CN CNB2005100837110A patent/CN100473845C/en active Active
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EP2157319A1 (en) * | 2008-08-20 | 2010-02-24 | HAWE Hydraulik SE | Hydraulic device for a hydro motor |
WO2013168723A1 (en) * | 2012-05-09 | 2013-11-14 | Smc Kabushiki Kaisha | Solenoid valve system |
US9488990B2 (en) | 2012-05-09 | 2016-11-08 | Smc Kabushiki Kaisha | Solenoid valve system |
Also Published As
Publication number | Publication date |
---|---|
CN1715685A (en) | 2006-01-04 |
GB2415516A (en) | 2005-12-28 |
US7398796B2 (en) | 2008-07-15 |
GB0511979D0 (en) | 2005-07-20 |
DE102004028437B3 (en) | 2006-03-02 |
CN100473845C (en) | 2009-04-01 |
GB2415516B (en) | 2008-12-24 |
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